Weft detector mounted on regularly-moving transferrers



Mmh 13, 192s. '1,662,219

R. G. TURNER WEFT DETECTOR MOUNTED ON REGULARLY MOVING TRANSFERRERS Filed "@ug. 6. 1926 "E as'A /Jo J5 W Je n. "um I dife/'nys Patented Mar. 13, 1928.

NUNIV-TED f STATES PATENT @FICE- RICHARD GREENLEAF v1:ORA'IOILY OF MASSACHUSETTS.

y TURNER, or woEoEsfrEn, Massncirnsn'rrs, `Assrsnoa To oaoMrfroNa KNoWLEs Loon wenns, or` WORCESTER,

MASSACHUSETTS, A COR- WEFT DETECTOR MOUNTED ON REGULARLY4MOV1NVG 'FRANSEERIBvlEllaS.V

Application filed August 6,1926.

This invention relates to improvements in wett detectors which are located in regu* larly moving trans'lierrer arms for lwett replenishing looms, and it is the principal object ot the invention to render more certain the action oi a. side slipping weft detector which derives its operative movement Afrom the inertia thereof.

ln copending application, Serial #120,491

here is shown a wett detector mounted on a carrier lever pivoted to a trans'ierrer arm which receives a movement toward the bobbin on -detecting beats of the loom. The lever and detector ar'enormally raised but as the transfer-rer arm comes to a sudden stop in its descent the energy stored in the detector and lever tends to keep these parts in motion and they move toward the surface to be detected.

In the first experiment which I made with this type of detector employing a side slip detector I used a comparatively light spring to return the detector to normal position and a somewhat heavier spring to hold the `carrier lever-in its normally raised position. lVith such a construction the detector Shows a tendency -to rebound away from the sur? tace being detected and `to move into im proper Contact with the latch which retains the indicating plunger `in inoperative position.

lVhen the transierrcrlarm comes to rest the inertia 'torce of' the detector and carri-cr lever must be considerably stronger than the torce ot the spring which holds them in raised position so that they can move with certainty toward the bobbin. As these parts descend part ot their inertia Vforce is counteracted by the spring attached to the carrier, the inertia. 'force growing less and less as the carrier lever and detect-or ap proach the bobbin. At the time the detector engages the yarn the remaining inertia torce will tend to cause the detector to move along the bobbin, this movement being resisted at all times by the detector spring and on non-indicating detecting beats o'f the loom by the yarn also.

It is further an object ot my invention to choose a detector spring which will exert. a force almost but not quite equal to the revseriai No. H1694.

maininginertia force ot the detector and carrier lever so that there 'will not be sut'- licient excess of torce` to causerebounding and the detector willremain in sliding conH tact with the bobbin., thus insuring a continuous contact withthe wett and avoiding the objectionable rebounding.

lVith these and other objects `in view which will appeal.' as the description proceeds, my invcntioirresidcs iintlie"coin` bination vand 4arrangement 'o't'parts hereinafter described and settorth in the cla-ini.

In the accompanying drawings, wherein I have shown one form ot my invention,

Fig. `1 is a vertical longitudinal section thru that Vpaitotthe transfer-rer arm which extends above and parallel to the bobbin when the latter indetecting position, showing the detector in` Contact wih a iiull bobbin, n'

Fig. 2 is a view similar to Fig. 1 but with the detector in contact with a substantially exhausted bobbin and moved to indicating position, and i Fig. 3 is an end elevation taken in the direction Lof arrow y3,Fig.v 2; v

Referring to the drawings it will be seen that I have provided 'atransferrer 'arm 1() having a. portion 11 extending` above and parall'eltor the bobbinB fand having Slidably mounted therein fa plunger 12 ormedwv'ith a shoulder 13 which receives the right hand thrust on la compression spring 14 as lseen in Figs. 1 and lThe left hand end ot"L spring 14 bears againstlthe web 15 thru which extends a :reduced shank 16 of the plunger 12. Pin'l'is passed thru the shank and limits right hand movement ot the plunger under action of the spring.

The mechanism for, normally holding plunger 12 in the inoperative position in F 1 comprises a latch 18 pivoted on a pin 19 mounted in the transferrer arm. aid latch has a hook 2O which is held in a notch :21 formed in the shank 16 by a torsion spring 22, one end of which as indicated at 2? ext-ends over a part of the portion 11 and the other end as indicated at Q4 extends over the latch 18, the intermediate portions being coiled around stud or pin v19. Said latch is provided with a depending` arm 25 moved to the right from the position shown in Fig. l at the time of indication of substantial weit exhaustion to release the plunger.

The detector 26 has a curved yarn engaging toothed surface 27 and is pivoted as at 2S to a lever 29 which in turn is pivotally mounted for tree movement on a stud 30 secured to the transfer-rer arm. Said lever Q9 has a tail 31 which normally engages that portion oi the transferrer arm which serves as a housing for the plunger l2, being held in this position by a tension spring 32 one end of which is held by a screw 33 and the other end of which is caught on a linger Si formed integrally with lever 29.

The detector 26 has an upwardly projecting arm 35 provided with a stop screw 36 placed to engage a boss 3T formed on lever 29 for the purpose of properly1 locating the detector. The upper end oi arm receives one end of a relatively heavy tension spring 38, the right hand end of which is held adjustable in a lug 39 by screw 40.

In Operation the transfert-er arm it) is moved downwardly toward the bobbin B on detecting beats ot' the loom hy mechanism not shown but set lorth in Patent #1,372,316 to l'yon. Lever :'29 is held yieldingly in raised position by comparatively light spring 52 during said downward motion, but when the transfert-er arm comes to resti the energy stored in the lever 29 and detector will cause them to continue downwardly toward the hobhin to eti'ect Contact between the detector and the bobbin. If .sullicient weft is present the teeth 27 will prevent movement of the detector along' the hobhin, but il,E insutiicient wei't is present the detector will slide along the bare bobbin because ot' the fact that the teeth 2T are out ot vertical alignment with the pivot 28. The detector will move into engagement: with the arm :25 to rock the latch 1S in a countereloeliwise directiml to the position shown in Fig. E2 against the action of relatively7 heavy spring 3S. The hook 2t) will therefore be moved out ot' notch 21 and spring lst will move the plunger to the right to the position indicated in Fig. 2, which, as set forth in my aforesaid patent, corresponds to indication ot' wei't exhaustion to the reiilenishing mechanism.

As previouslv stated it is found that by having spring J8 relatively heavy the dctiector can be kept; in contact; with the surface being detected and rebounding and eonsequently improper or premature indication he avoided.

From the foregoing it will be seen that I have provided a wett detector ior a regularly moving translerrer arm wherein the sin-inf; which holds the wel't detector in normal position exerts a i'orce almost equal to the inertia torce ot the descending detector and carrier lever, the etl'cet o1" this relation lV/eing to cause the detector o remain in contact with the detected surface and thus avoid rebounding.

Having thus described my invention it, will be apparent that changes and modilieations may be made therein by those skilled in the art without departing Afrom the .spirit and scope ol." the invention and l do not, wish to be limited to the details herein disclosed. but what l claim is:

In a wett detector meehanisni for a loom having' a transferrer arm moved toward and arrested in its motion toward the .surface to be detected on detecting beats ol' the loom.

a side slip wel't detector, a carrier for the detector pivotally mounted on the transfer rer arm and movable toward the surface to be detected when the t'ranslierrer is arrested in its movement towards the surlaee to he detected by reason ot the` inertia ol said detector and carrier, yielding means to hohl the carrier and detector in raised positioitf other yielding means to hold the detector in normal position relatively to the carrier, said first yielding means exerting a 'l'oree considerably less than the. inertia i'oree ol the deter-tor and carrier and .said second yielding means exerting a Al'orce only .slightly less than the inertia force otl the earrier.

ln testimony whereof I have hereunto allixed my signature.

RICHARD GREENLEAF TURNER. 

